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Saturation diving is staying under the surface for periods long enough to bring the body’s tissues into equilibrium with the partial pressures of the inert components of the breathing gas.

The concept that Captain Bond developed was “saturation diving,” which involves putting divers under high atmospheric pressure before descent and bringing them back to normal very gradually.

And he delineates the physics and physiology of free and ‘saturation’ diving, submersibles such as Cornelis Drebbel’s seventeenth-century wood-and-leather vessel, and the robots slated to replace deep-ocean researchers.

Capt. Mazzone helped Bond lead the animal and human tests that developed saturation diving, a technique that made possible dives lasting hours, days and eventually weeks.

Divers will use a technique called saturation diving where the undersea habitat is pressurized to mimic what is found on earth's surface and prevent decompression sickness, when human tissue can absorb gases like nitrogen in dangerously high volumes.